358 



NORTH AMERICAN INDEX FOSSILS. 



83. H. kolmodini Jones. (Fig. 1665, /-/l) Devonic. 

 Marginal frill obsolescent; a thick curving ridge within the 



posterior ventral border partly embraces the minor lobe. 

 Bryozoan bed (Onondaga) of Falls of Ohio. 



84. H. tricollina Ulrich. (Fig. 1665, i/l) Devonic. 

 Marginal frill sharp, not quite reaching posterodorsal margin; 



Fig. 1665. a-c, Bollia obesa (55)/lf.ft valve, X ^o ; d, e, B. ungula (56), left 

 valve, X 10 > f-fi-i Hollina kolmodini ( 83), exterior, dorsal and interior views of right 

 valve, X 10; i-k, Treposella lyoni (77), three views of right valve, X ^^j A ^^y- 

 richia hamillonensis (69), X lo ; m, Hollina tricollina (84), left valve, X '3 > '^j ^> 

 Kirkbya costata (95)> X 'OJ P-'''i J^- Undahli {^^d)^^ \o\ s, t, K. venosa (97), 

 right valve, X '4 > w--^, Barychilina pundostriata (99), left, posterior, dorsal and 

 right view of a complete carapace, X lo ;/> 2, Pachydomella tumida (100), right and 

 anterior views, X I4- (^> after Jones ; the rest after Ulrich.) 



minor node small ; a third rounded node near posterodorsal margin. 

 Hamilton group of New York, etc. 



85. H. radiata Jones and Kirkby. (Fig. 1666, a.) Carbonic. 



Marginal frill only on ventral side; major and minor nodes 

 close together ; surface, including nodes, pustulose. 



Cottonwood shales of Kansas. 



XXXIV. Klcedenella Ulrich and Bassler. 

 Differs from Klccdenia chiefly in the more cylindrical form of the 

 shell and the greater inequality of its valves, the right overlapping 

 the left; differs from Beyrichia in the relative convexity and loba- 

 tion of the valves. About ten species. Siluric-Devonic. 



